package collection1;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

/** 泛型的演示*/
public class GenericDemo {
    public static void main(String[] args) {
        Collection<String> c = new ArrayList<>();//泛型集合
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        //c.add(123);//编译错误，123的类型违背了集合c指向的泛型的实际类型String

        //迭代器所指向的泛型应当与其他遍历的集合的泛型一致
        Iterator<String> it = c.iterator();
        while (it.hasNext()){
            String str = it.next();
            System.out.println(str);
        }

        for (String str:c){
            System.out.println(str);
        }




    }
}
